Burglar alarm



1,453,058 A. zuKoR -BURGLAR ALARM Apr. 24,1923.

"Filed sepn, 1922 IN VEN TOR Patented Apr. 24, i923.

ARNOLD Zirkon, or Nnw Yoan, N. Y.

tisanes i. li

Bonanni. ALARM.'

Application led September 5, 1922.

To all w hom t may concern:

Be it known that I, ARNOLD Zunon, a citizen of the United States, andresident of the city of New York, in the county of New York and State ofNew York, have invented certain new and useful Improvements 'in BurglarAlarms, of which the following is a specication.

The present invention relates to improvements in burglar' alarms.

One of the objects of the invention is to provide a device of thischaracter which is simple in construction, eflicient in operation n andcapable of manufacture on a commercial scale, or in other words onewhich is not so diiiicult'to make as to be beyond the reasonable cost ofsuch a contrivance.

Another object of the invention is to produce a device of this typewhich may be readily placed in position toprotect a door, it beingactuated by the ydoor when the same is attempted to be moved toward openposition.

With these and other objects in view, which will appear as the nature ofthe invention is better understood, the same consist-s in thecombination, arrangement and construction of parts hereinafter fullydescribed, pointed out in the appended claim and illustrated in theaccompanying drawings, it being understood that many changes may be madein the size and proportion of the several parts and minor details ofconstruction without departing from the spirit or sacrificing any of theadvantages of the invention.

One of the many possible embodiments of invention are illustrated in theaccompanying drawings, in which :P

Fig. l is a side elevation of the improved alarm, shown applied to adoor; Fig. 2 is a front elevation, on a larger scale, of a portion ofthe alarm shown in Fig. l; Fig. 3 is a sectional view of thedetail'shown in 2; Fig. 4 is a front elevation'of a mechanism fordetachably fastening the alarm shown in Fig. 1 to a door; Fig. 5 issimilar elevation of the said fastening device, the elements being shownin other positions; and Fig. 6

is a section taken on line 6--6 of Fig. 5.

In the drawings, the burglar alarm is attached to the inner face of adoor 4l and rests upon the floor of the room. In this instance, there ispivoted at 42 a bar 43 to an element- 44, the latter being secured byscrews, or otherwise, to the door. The pivot pin 45 on the bar 43extends through a sta- Serial No. 586,161.

tionary ear 46 and a movable ear 47 on a base plate 48, the base platebeing Xed to the door. A set screw 49 serves to holdthe movable ear inthe desired position relative to the stationary ear 46, preventing adisengagement of the bar y43 from the element 44. Upon the outer end ofthe bar 43 is mounted a piston 50, slidable in a cylinder 5l on a bar52, the lower free end. of which is pointed, as shown at 58, it being anengagement with a corrugated plate 54, that is'fixed to the floor 'adjacent to the door. A spring 55 is disposed within the cylinder 51,itspurpose being to hold the bar 43 in its elevated position. To thecylinder is attached a bell 38, preferably, a rotatable bell, containinga suitable mechanism, such as a hammer and actuating mechanism therefor,whereby, when the bell is released and allowed to be revolved by theusual spring motor, the bell is sounded. With the escapement of themotor of this bell co-operates a stop 40, which is disposed in operativerelation` to apin 56, that is attached tothe pistonk 50, extendingthrough a longitudinal slot 57 in the said cylinder.

The operation of this device is as follcns-When the door is beingopened, the piston 50 is depressed against the action of the spring 55,the rpin 56 being brought into abutment with the stop 40, forcing thevsame downwards and releasing the escapement of the spring motor.Inasmuch as the lower end ofthe bar 52 is seated in one or" thecorrugations of the plate 54, the door can be opened to a certain eX-tent only. The device acts thus, besides being a burglar alarm, as asafety device for the door.

What I claim is:

The combination with a door, of a bar attached thereto at its upper endand carrying at its lower end piston, acylinder in which said piston isslidably arranged, a second bar fixed to said cylinder forengagementwith the floor adjacent the door, the longitudinal axes of saidbarsforming a continuation of one another, a bell carried by said cylinder,a pin mounted upon said piston and adapted, when moved, to operate saidbell, and a spring within said cylinder bearing on said piston fornormally holding said pin disengaged freni said bell.

Signed at New York, in the county of New York and State of New York,this 29th day of August, A. D. 1922.

' ARNOLD ZUKOR.

